5.8
Section 5
Fuel System and Governor
Cleaning
WARNING: Flammable Solvents!
Carburetor cleaners and solvents are extremely
fl ammable. Keep sparks, fl ames, and other sources
of ignition away from the area. Follow the cleaner
manufacturer’s warnings and instructions on its proper
and safe use. Never use gasoline as a cleaning agent.
All parts should be cleaned thoroughly using a
commercial carburetor cleaner. Make sure all gum
deposits are removed from the following areas.
• Carburetor body and bore; especially the areas
where the throttle plate, choke plate and shafts
are seated.
• Idle fuel and idle ports in carburetor bore,
main jet, bowl vent, and fuel inlet needle
and seat.
• Float and fl oat hinge.
• Fuel bowl.
• Throttle plate, choke plate, throttle shaft, and
choke shaft.
NOTE: Do not submerge the carburetor in
cleaner or solvent when fi ber, rubber, or
foam seals or gaskets are installed. The
cleaner may damage these components.
Inspection
Carefully inspect all components and replace those
that are worn or damaged.
• Inspect the carburetor body for cracks, holes, and
other wear or damage.
• Inspect the fl oat for cracks, holes, and missing or
damaged fl oat tabs. Check the fl oat hinge and pin
for wear or damage.
• Inspect the fuel inlet needle and seat for wear or
damage.
• Inspect the tip of the low idle fuel adjusting needle
for wear or grooves.
• Inspect the throttle and choke shaft and plate
assemblies for wear or excessive play.
Figure 5-10. Cutaway View Showing Self-Relieving
Choke Carburetor.
Removing Old Parts
1. Remove the black dust cover. This cover snaps
on and off.
2. Remove and discard the two screws fastening
the choke plate to the choke shaft.
3. Remove and discard the choke plate and choke
shaft from the carburetor.
4. Remove the upper brass bushing using one of
the following procedures:
a. Use a slide hammer type bearing puller.
b. Use a #3 (for 5/32 dia. hole) screw extractor.
Secure extractor in a vise. Turn carburetor
on to the extractor. While pulling on the
carburetor, lightly tap the carburetor casting
with a hammer or use a size 12-28 tap if a
#3 screw extractor is not available.
Throttle Shaft Removal
Do not attempt to remove the throttle shaft, as repair
kits are not available. Throttle shaft wear is normally
accompanied by corresponding wear to the carburetor
body, making it impractical to attempt a cost-effective
repair. Replace the entire carburetor if the throttle
shaft is worn.
Dust Cap
Choke Lever
Spring
Brass
Bushing
Stop Pin
Choke
Valve
Screws
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